Jaundice

Lore & Background

Jaundice is typically caused by an underlying pathological process along the normal physiological pathway of heme metabolism. The condition is classified into three categories: prehepatic, hepatic, and posthepatic, depending on which part of the mechanism is affected. Prehepatic jaundice most commonly results from increased red blood cell hemolysis, as seen in sickle-cell anemia, thalassemia, or infections like malaria. Hepatic jaundice arises from liver damage due to hepatitis, cirrhosis, drug toxicity, or genetic conditions such as Gilbert's syndrome. Posthepatic jaundice, also called obstructive jaundice, is caused by blockage of bile ducts, often due to gallstones, pancreatic cancer, or biliary strictures.

Reader's Guide

Jaundice serves as a critical clinical indicator of underlying disease, with treatment determined by the specific cause. In adults, jaundice is rare but typically signals serious conditions such as liver dysfunction or bile duct obstruction. In newborns, it is common and often benign, though severe cases may require phototherapy or exchange transfusion. The condition's pathophysiology involves the breakdown of heme from red blood cells, conjugation in the liver, and excretion via bile. Disruptions at any stage—prehepatic, hepatic, or posthepatic—can lead to elevated bilirubin and jaundice. The word 'jaundice' derives from the French 'jaunisse,' meaning 'yellow disease.' Accurate diagnosis relies on distinguishing jaundice from other causes of yellow skin, such as carotenemia or medication effects. The condition's significance lies in its role as a visible marker for potentially life-threatening diseases, guiding further investigation and management.

Did You Know?

• Jaundice in adults is rare, while about 80% of babies are affected during their first week of life.
• The term 'scleral icterus' is a standard term for yellowing of the sclera due to bilirubin binding to its elastic fibers.
• In individuals with darker skin tones, jaundice is more reliably observed in the conjunctivae, palms, soles, and oral mucosa.
• A rare sign of jaundice in childhood is yellowish or greenish teeth due to bilirubin deposition during tooth calcification.